Light-emitting module

Abstract

A light-emitting module includes: a support base having a plurality of placement surfaces arranged in a first direction; a plurality of light-emitting devices each disposed on the respective corresponding placement surface, and each including a semiconductor laser element, a first mirror member, a cover, and a second mirror member; a plurality of third mirror members; and a condensing lens. The first mirror member changes a traveling direction of a laser beam emitted from the semiconductor laser element. The cover transmits the laser beam having the changed traveling direction. The second mirror member further changes the traveling direction of the laser beam transmitted through the cover to a second direction. Each third mirror member changes the traveling direction of the laser beam from the second direction to the first direction. The condensing lens combines a plurality of laser beams and allows the combined light to be incident on an optical fiber.

1 . A light-emitting module comprising:
 a support base having a plurality of placement surfaces arranged in a first direction;   a plurality of light-emitting devices each disposed on a respective corresponding one of the plurality of placement surfaces, each light-emitting device comprising:
 a substrate having a mounting surface, 
 a semiconductor laser element supported by the mounting surface, 
 a first mirror member supported by the mounting surface, 
 a cover that has a facing surface facing the mounting surface of the substrate, and an upper surface positioned on a side opposite to the facing surface, and is positioned above the semiconductor laser element and the first mirror member, and 
 a second mirror member supported by the upper surface of the cover; 
   a plurality of third mirror members; and   a condensing lens, wherein:   the first mirror member has a first reflective surface inclined with respect to the mounting surface and oriented obliquely upward,   the second mirror member has a second reflective surface, at least a portion of the second reflective surface being positioned above at least a portion of the first reflective surface,   the semiconductor laser element is configured to emit a laser beam toward the first reflective surface,   the first reflective surface is configured to reflect the laser beam to change a traveling direction of the laser beam to a direction away from the mounting surface of the substrate,   the cover is configured to transmit the laser beam reflected by the first reflective surface,   the second reflective surface is configured to reflect the laser beam reflected by the first reflective surface to further change the traveling direction of the laser beam to a second direction intersecting the first direction,   each of the plurality of third mirror members has a third reflective surface configured to reflect the laser beam traveling in the second direction to change the traveling direction of the laser beam to the first direction, and   the condensing lens is configured to combine a plurality of laser beams obtained by the laser beams emitted from the plurality of light-emitting devices being reflected by the third reflective surface, and allow the combined light to be incident on an optical fiber.   
     
     
         2 . The light-emitting module according to  claim 1 , wherein a resin layer is located between a lower surface of the second mirror member and the upper surface of the cover. 
     
     
         3 . The light-emitting module according to  claim 1 , wherein the cover comprises a light-shielding film on the facing surface of the cover, the light-shielding film positioned at least around a region through which the laser beam is transmitted. 
     
     
         4 . The light-emitting module according to  claim 1 , further comprising a fast-axis collimating lens that is positioned between the mounting surface of the substrate and the facing surface of the cover and is positioned on an optical path of the laser beam. 
     
     
         5 . The light-emitting module according to  claim 1 , wherein the substrate is formed of a material having a thermal conductivity in a range from 10 W/m·K to 2000 W/m·K. 
     
     
         6 . The light-emitting module according to  claim 1 , comprising:
 a frame body that is positioned around the mounting surface of the substrate and supports the cover, wherein:   the semiconductor laser element is hermetically sealed by the substrate, the frame body, and the cover.